ex2ms
Translates Elixir functions to ETS match specifications for efficient Erlang Term Storage queries.
What is ex2ms?
Ex2ms is an Elixir library that translates Elixir functions into match specifications for use with Erlang's ETS (Erlang Term Storage). It solves the problem of writing verbose, low-level ETS match specs by allowing developers to define queries using Elixir's function syntax, which is then automatically converted into the format ETS requires for efficient data matching and retrieval.
Elixir developers working with ETS for in-memory data storage who need to write complex queries and want to avoid manually crafting error-prone match specifications.
Developers choose Ex2ms because it simplifies ETS query creation with Elixir's expressive syntax, reduces boilerplate, and integrates seamlessly with existing ETS workflows, making high-performance data access more accessible and less error-prone.
Overview
:ets.fun2ms for Elixir, translate functions to match specifications
Use Cases
Best For
- Writing complex ETS queries with Elixir function syntax
- Converting guard-based conditions into ETS match specs
- Interactive ETS query testing in IEx
- Simplifying match specification generation for Erlang Term Storage
- Bridging Elixir and Erlang data access patterns
- Performance-critical in-memory data filtering in Elixir applications
Not Ideal For
- Projects that rely solely on database queries without using ETS for in-memory storage
- Developers needing to write highly optimized, manual match specs for performance-critical edge cases
- Teams working exclusively in Erlang without Elixir integration
- Applications requiring real-time data validation outside of ETS match specifications
Pros & Cons
Pros
Converts Elixir function expressions into ETS match specs, allowing developers to write queries in familiar Elixir syntax instead of verbose Erlang formats, as shown in the README's fun do example.
Directly works with Erlang's :ets functions like :ets.test_ms/2 for validating and using generated match specs, enabling quick testing without manual setup.
Supports guards within function patterns (e.g., when x > 10), simplifying conditional matching for complex ETS queries without low-level code.
Designed for use in IEx, facilitating rapid iteration and testing of match specs, as demonstrated in the interactive shell examples.
Cons
Only converts to ETS match specifications, so it cannot be used for other Erlang/OTP features like Mnesia or custom data storage systems, restricting its scope.
May not support all Elixir function features or complex patterns, which could require fallback to manual spec writing for advanced use cases, though not explicitly mentioned in the README.
If translation fails or produces incorrect match specs, debugging can be challenging due to the abstraction layer between Elixir syntax and low-level ETS formats, with limited error handling shown.
Frequently Asked Questions
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